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(No Model.)

J. BARNES.

' SYRINGE. J No. 353,528. Patented Nov. 30, 1886.

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Unwrap STATEs PATENT Urrrcn.

JOSHUA BARNES, OF BROOKLYN, NEW YORK.

SYRINGE'.

SPECIFICATION forming part of Letters Patent No. 353,528, dated November30, 1886.

Application filed August 21, 1886. Serial No. 211,466.

To all whom. it may concern.-

Be it known that I, JOSHUA BARNES, a citizen of the United States, and aresident of Brooklyn, in the county of Kings and State of New York, haveinvented certain new and use ful Improyements in Syringes, of which thefollowing is a specification.

My invention relates to syringes, and has for its object to provideimproved means for maintaining a continuous or uninterrupted flow withonly one bulb or single-acting pump.

The invention will be hereinafter fully described, and specificallypointed out in the claims, reference being had to the accompanyingdrawings, in which- Figure .1 represents a general View of my improvedsyringe complete, partly broken out in longitudinal central section.Fig. 2 is a detail longitudinal section showing a modification in themanner of securing the air-chamber. Fig. 3 is a sectional detail showinga modification in the construction of the airchamber.

A is the inlet tube or conduit, preferably made of rubber, as usual. Inorder to sink it without noise when using, I provide for sinker simply ametallic ring, a, pushed into the tube A to a little distance above theend, as shown in the drawings. Below the sinker a side openings, a, aremade in the tube for use in suspending the syringe for drying.

B is the bulbor pump, which is single-acting, as usual, provided at eachend with a valve-nipple, b, and operating the syringe on the compressionof the bulb, the bulb refilling in expanding, as usual.

0 is the outlet tube or conduit, attached at one end to thevalve-conpling b, and provided at the other end with the ordinarydischargenozzle, 19. In order to prevent the tube 0 from getting off thecoupling b, I provide upon the lattera rigid or non-flexible ring, H,which ring may be slid upon the coupling and over the end of the tube,to compress it in the circulargroove of the coupling, as shown in Fig.1.

IVithin the conduit 0, I arrange an elastic air-chamber, D, preferablymade of a soft-rubber tube. the object of which is to produce acontinuous flow, which is accomplished in the following manner: \Vhcnthe conduit 0, surrounding the air-chamber D, is full of water (Nomodel.)

or other liquid and the bulb B compressed to operate the syringe, thechamber D is compressed or contracted by the pressure of the surroundingliquid, and when the pressure is withdrawn from the bulb B, to allow itto expand and refill, and consequently the pressure upon the chamberD isreleased, the said chamber expands, and thus forces the liquid outthrough the nozzle, thereby keeping up a continuous flow just aseffectually as a double-acting pump, the compression of the bulb B andthe expansion of the chamber D acting alternately to maintainuninterrupted flow.

The chamber D may be either closed, as in Figs. 1 and 2, orcommunicating with'the outer air, as in Fig. 8. When entirely closed,any air-tight flexible material may be used, the acting power being thenthe expansion of compressed air; but if the chamber D is communicatingwith the outer air the material itself should be elastic, preferably ofrubber, so as to resume its normal shapethat is, expanding by its ownelasticity,the elasticity of the material itself in that case effectingthe pressure.

In order to retain the chamber D in place within the conduit 0, it mayeither be fastened to the said conduit itself, as in Fig. 1, or to thecoupling 1), as in Fig. 2. In either case the closed chamber has atubular extension, d, provided with side openings, (1, through which thewater from the bulb and coupling enters the conduit C, as indicated byarrows in Fig. 2. The said extension (I may be cemented to the conduit0, as in Fig. 1, or it may be eX- panded over the end of the coupling 1)before attaching the end ofthe conduit upon the coup ling, as shown inFig. 2.

In Fig. 3 is shown a small vent or pipe, (1 which connects the interiorof the chamber D through the side of the conduit Owith the outerair-,the outer end of the little vent-pipe d be ing, of course, cementedor secured to the conduit in an air and water tight manner. \Vhen thesaid pipe or vent is used, as in Fig. 3, there is no necessity for theextension d or other fastening to keep the chamber D in place.

Fisanormally-open spring-clasp,whose arms f, having inward-bent ends,may be pressed toward each other to flatten the tube, and thus stop theflow, and kept so compressed,ifdesired, by pushing a ring, G, over them.I lay no claim to the said clamp'F, nor to the noiseless a syringe orlike article, an elastic tube or I 5 sinker above described, nor to theside openchamber placed within the said conduit, and a ings, at, belowthe sinker. I am aware, also, vent connecting the said elastic chamberwith that it is not new to provide an uninterrupted the outer air,substantially as and for the pur- 5 flow in a syringe having only onebulb or pump. pose set forth. i

Having thus described theinvention, what I In testimony that I claim theforegoing as 2 claim as new, and desire to secure by Letters myinvention I have signed my name, inpres- Patent, is' v ence of twowitnesses, this 14th day of August,

1. A syringe or like article having in its out- 1886. 1o let-conduit aflexible air-chamber contracting under pressure and expanding oncessation of JOSHUA BARNES pressure from the bulb or pump, for the pur-Witnesses: pose set forth. A. W. ALMQVIST,

2. In combination with the outlet'conduit of HELMER WESTEEN.

